I think it would be A if not I am sorry
It means the person chooses to use more of his emotions to react to a certain situation or resolve issues rather than using logic or brainpower.
"B. By the light of the moon, I tripped over a <span>rock" would be the only sentence with a dangling modifier, since in this case it is unclear what exactly is being modified, since the moon light and the tripping incident could be two, separate events in time. </span>
